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[–]kissfan7 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (3 children)

How rare does something have to be before it's considered an outlier?

Also, nobody mentioned anything about mammals until you just now.

[–]goodbyeplanet 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 2 fun -  (2 children)

[–]kissfan7 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Pardon my laziness, but to save time I Ctrl + Fed "outlier" and couldn't find anything.

[–]goodbyeplanet 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I'm not going to give you a lecture on the use of statistics in data analysis, although any stats 101 book will have that information. You can google what an outlier is. I'm sure there's a khan academy video describing this.

EDIT: generally it's the idea that a point of data that is radically different from the trend seen in the rest of the data is going to shift the results in a way that does not fairly represent the mean and variance of the data. As such, if this point is very rare in the sample, it is safe to disregard it. In order to be statistically significant scientifically, enough points have to be different in order to show directionality in the data, to prove that this is a trend.

In the case of intersex people, the population size suggests they are not a new form of human reproduction (sex), but people who have a rare genetic disorder.